Ratios and Proportions
Ratios
and Relationships
Ratios
express a relationship between
One Part
and The Whole,
or between Two Parts.
The Ratio
is expressed using a
colon.
The colon
looks like
:
Using a Ratio
to show the Relationship
between One Part
and The Whole.
In this example, the
whole
is nine parts.
The whole
is made of
circles,
triangles,
squares.
Circles
=
4
Triangles
=
3
Squares
=
2
To express this relationship as a
Ratio,
use the number of the
Part
and the number of the
Whole
separated with a colon.
The Ratio
of circles
to all shapes
is 4
:
9
There are 4
circles in every
whole of 9 parts
The Ratio
of triangles
to all shapes
is 3
:
9
There are 3
triangles in every
whole of 9 parts
The Ratio
of squares
to all shapes
is 2
:
9
There are 2
squares in every
whole of 9 parts
The Ratio
is read as Parts in
Total or
Parts to Total
Circles
4
:
9
4
to
9
Triangles
3
:
9
3
to
9
Squares
2
:
9
2
to
9